Merge pull request #1681 from CEED/jrwrigh/fix_fluids_alpha

fix(fluids): Update tests for fixed ts_type alpha

fix(fluids): Update tests for fixed ts_type alpha

The startup logic for `ts_type: alpha` was fixed in petsc/petsc!7816, so
the reference solutions needed to be fixed as well.

Merge pull request #1609 from CEED/jrwrigh/fix_riemann_solvers

fluids: Fix Riemann solvers *_fwd mode functions

fix(fluids): Correct Riemann HLL *_fwd functions

Merge pull request #1568 from CEED/jrwrigh/fix_blasius_state

fix: Correct P0 deprecation

fluids: Introduce -idl_pressure option

Also re-instates the old P0 behavior with regard to the idl_pressure

Ken/idl (#1138)

* inflow sponge pushing p towards P0 compiles and runs but unknown yet whether it is effective or not

* looks like my first attempt at this is missing something as there is neglig

Ken/idl (#1138)

* inflow sponge pushing p towards P0 compiles and runs but unknown yet whether it is effective or not

* looks like my first attempt at this is missing something as there is negligible effect from Jacobian addition

* examples/fluids: IDL fixes and demo

* Fix IDL sign error and rename variables/clang-format
* Let newtonianwave.yaml use -reference_pressure and temperature
* Propagate P0 = reference.pressure

* Small tweak to add IDL to the 3 ramp parameters.

* fluids: Extract fluids binary vector load function

- Needs to be used in multiple places (for ICs and for testing data)

* fluids: Correct typo in previous commits

* fluids: Add IDL and newtonian wave test

* fluids: Rename Newtonian Wave --> Gaussian Wave

* fluids: Move RampCoefficient into utils

- Also change name to LinearRampCoefficient, as we may have different
kinds of ramps in the future

* fluids: Change IDL commandline options

* docs(fluids): Document internal damping layer

Co-authored-by: Jed Brown <jed@jedbrown.org>

* fluids: Add ScaleN QF utility

* fluids: Extract InternalDampingLayer QFunction helper

---------

Co-authored-by: Jed Brown <jed@jedbrown.org>
Co-authored-by: KennethEJansen <jansenke@colorado.edu>
Co-authored-by: James Wright <james@jameswright.xyz>

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